Matthew 17:17
Jesus answered and said: faithless and perverse generation, how long shall I be with you? How long shall I bear with you? Bring him hither to me.
Matthew 17:20
And Jesus said to them: Because of your unbelief. For verily I say to you, If you have faith like a grain of mustard-seed, you shall say to this mountain, Be removed from this place to that, and it shall be removed: and nothing shall be impossible for you.
Luke 1:20
And behold, you shall be dumb and not able to speak, till the day in which these things shall take place, because you did not believe my words, which shall be fulfilled in their proper time.
Luke 1:45
And blessed is she who believed; for there shall be a fulfillment of the things which were spoken to her from the Lord.
John 1:17
for the law was given through Moses, but the grace and the truth came through Jesus Christ.
Romans 4:20
and he doubted not, through unbelief, with respect to the promise of God, but was strong in faith, giving glory to God,
1 Peter 3:15
but reverence the Lord God in your hearts, and be always ready to answer every one that asks of you a reason for the hope that is in you, with meekness and fear;